My Purchase Order (PO) is failing with below error in Cloud Integration Gateway (CIG):

Ariba Network Response is :"Forbidden" and Error Code:"403" and Error Code Response:"Error:Customer not entitled to create new supplier. Please contact support with the Error Reference Number: ANERR-XXXXX for more details. Suggested Action : Document Failed in Ariba Network.For further assistance, please contact Ariba Support with the code mentioned in Response.CIG Support Error Code : CIG-PLT-00644.

Please follow below steps to resolve the issue:

1. On your buyer account, click Administration.
2. Click Configuration.
3. Click Cloud Integration Gateway Setup.
4. Uncheck the checkbox Enable the Cloud Integration Gateway.
5. Check the checkbox Enable the Cloud Integration Gateway.
6. Click Save.

Resend the PO which failed initially.

This happens because a data sync is required to CIG. The above steps will do the needed sync.

Disabling/ Enabling the CIG checkbox is not allowed if CIG is the default end point for any system ID configured in your buyer account. In this case, you need to temporarily change the default end point to some other non CIG end point for all the system IDs configured.
Once the resolution steps are completed, please revert the end point configuration to the original settings.

SAP Business Network for Procurement & Supply Chain > SAP Ariba Supply Chain Collaboration